Hydrophilic fibres on the opposite surface aid hydration by drawing water into the cement.
相对表面上的亲水性纤维通过把水吸入水泥来帮助水合。
For a time, surface and subsurface current are in opposite directions;
在一个时期，表层和次表层的水流方向相反；
For a time, surface and subsurface current are in opposite directions;
在一个时期，表层和次表层的水流方向相反；
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